Shell advanced syntax? Post: 302463844

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I have a variable named "xyz" Now what will the below snippet mean: if ( ${?xyz} ) then .... endif What does ? signify here. Thanks

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I'm having simple question here, and what's the different here? What is the "x" for? Thanks!

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| help | unix | grep (GNU grep) 2.5.1 | advanced regex syntax

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Hello, I have a newbe syntax error but I cant find it syntax error: unexpected end of file #!/bin/csh # pe request #$ -pe mpi_16 32 #### 16 core : 'mpi_16 16' || 24 core : 'mpi_24 24 ' # our Job name #$ -N test2MD #$ -S /bin/sh

LEARN ABOUT V7

ppmtopgm

ppmtopgm(1)						      General Commands Manual						       ppmtopgm(1)

NAME

       ppmtopgm - convert a portable pixmap into a portable graymap

SYNOPSIS

       ppmtopgm [ppmfile]

DESCRIPTION

       Reads  a  portable  pixmap  as  input.  Produces a portable graymap as output.  The output is a "black and white" rendering of the original
       image, as in a black and white photograph.  The quantization formula used is .299 r + .587 g + .114 b.

       Note that although there is a pgmtoppm program, it is not necessary for simple conversions from pgm to ppm , because any  ppm  program  can
       read  pgm  (and	pbm  ) files automatically.  pgmtoppm is for colorizing a pgm file.  Also, see ppmtorgb3 for a different way of converting
       color to gray.  And ppmdist generates a grayscale image from a color image, but in a way that makes it easy to differentiate  the  original
       colors, not necessarily a way that looks like a black and white photograph.

QUOTE

       Cold-hearted orb that rules the night
       Removes the colors from our sight
       Red is gray, and yellow white
       But we decide which is right
       And which is a quantization error.

SEE ALSO

       pgmtoppm(1),ppmtorgb3(1),rgb3toppm(1),ppmdist(1),ppm(5),pgm(5)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

								   10 April 2000						       ppmtopgm(1)

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